Osgood-Schlatter disease

Osgood-Schlatter disease: understanding and treating the knee in young athletes

Seeing your teenager suffer from knee pain and having to limit the sports they love can be worrying. Between 10% and 20% of athletic teenagers develop Osgood-Schlatter disease during their growth spurt. If your child is one of them, know that you are not alone.

Here's the good news: this condition is not serious. In the vast majority of cases, it resolves completely and naturally once growth is complete. Your young athlete is not broken. Their knees are stronger than you think.

Physical therapy is the first line of treatment for managing these pains and enabling a safe return to sports. To understand how this discipline can help, check out our comprehensive guide to physical therapy and its therapeutic approaches.

What is Osgood-Schlatter disease?

Osgood-Schlatter disease is an irritation of the tibial tuberosity during rapid bone growth in athletic adolescents. It is not a true disease, but a normal overload reaction. It resolves naturally at the end of growth in more than 90% of cases.

An important clarification: the term "disease" may sound frightening, but it simply describes temporary discomfort related to skeletal development. The tibial tuberosity is the small bony bump located on the tibia, just below the knee. During growth, this area remains more fragile and sensitive to repetitive stress.

Feature	Details
Typical age	10-15 years old (boys 12-14 years old, girls 10-12 years old)
Location	Tibial tuberosity (bump below the knee)
Extreme sports	Soccer, basketball, volleyball, gymnastics, running
Appearance	Visible and palpable bump under the kneecap
Prediction	Complete resolution in 90%+ of cases

This condition occurs during puberty, at the time of maximum growth spurt. Young people who participate in sports involving repetitive jumping are at increased risk. Basketball, volleyball, gymnastics, and soccer are among the activities most often associated with this condition, as they place intense strain on the knee extension mechanism.

The frequency of this condition varies according to gender and level of physical activity. Boys are more often affected than girls, mainly because their growth spurt occurs later and often coincides with an increase in their participation in sports.

What symptoms should you look for in your teenager?

Symptoms include localized pain under the kneecap, aggravated by sports and jumping. A visible and sensitive bump appears at this location. The pain affects one knee in 60% of cases or both knees in 40% of cases. It always improves with rest.

Symptom	Features
Location	2-4 cm below the tip of the kneecap
Appearance	Visible bump, sometimes swollen
Aggravation	Jumping, running, stairs, kneeling
Relief	Rest, ice
Daily pattern	Absent upon waking, increases with activity

If you ask your child to point to where it hurts, they will place a finger directly on the tibial tuberosity. You can feel a small bony bump that is often swollen and painful to the touch.

Activities that aggravate the condition are predictable: jumping, running (especially accelerating or braking), climbing stairs, and squatting. Kneeling directly on the floor is particularly uncomfortable, as pressure is applied directly to the irritated area.

Swelling varies from one young person to another. It may feel slightly warm to the touch after sports. It should never be red or very hot, which would suggest an infection.

The daily progression of pain follows a characteristic pattern. In the morning upon waking up, your child generally feels no pain. Throughout the day, particularly after physical education classes or sports training, the discomfort gradually increases. This variation depending on activity is reassuring, as it confirms the mechanical nature of the condition.

What is NOT Osgood-Schlatter disease: Knee locking, instability, significant swelling of the entire joint. If these symptoms appear, another condition may be present.

Why does this condition occur during growth?

The condition results from a discrepancy between rapid bone growth and muscle-tendon adaptation during puberty. Repeated pulling of the patellar tendon on the growth plate causes irritation and pain. It is not an injury, but a normal reaction of a growing bone.

Important message: Your child has done nothing wrong. There was nothing you could have done to prevent this. Their knees are not defective. It is simply the result of a temporary imbalance between rapid bone growth and the adaptation of the surrounding tissues.

During puberty, long bones grow from growth plates located near the ends. These plates are areas of cartilage that gradually transform into solid bone. The tibial tuberosity plate appears around age 11 and fuses completely between ages 14 and 18.

The quadriceps muscle (at the front of the thigh) constantly pulls on the patellar tendon. This tendon attaches to the tibial tuberosity, a fragile growth plate. When young people do a lot of sports involving jumping and sprinting, this repetitive pulling irritates the growth plate.

The biomechanical process is easy to understand. Every time your child jumps and lands, every time they run and brake suddenly, every time they climb stairs, the quadriceps muscle contracts powerfully. This contraction generates a pulling force on the patellar tendon, which in turn pulls on the tibial tuberosity. In adults, this bone is mature and strong. In growing adolescents, this area remains vulnerable.

Several contributing factors increase the risk:

• Bone growth faster than muscle adaptation
• Stiffness in the quadriceps or hamstrings
• High training intensity
• Practicing several sports at the same time
• Sports techniques that heavily involve the extension mechanism

Muscle stiffness plays a particularly important role. If the thigh muscles (quadriceps and hamstrings) are stiff, they exert constant increased tension on their attachment points. This excessive tension increases mechanical stress on the tibial tuberosity.

How is this condition diagnosed?

The diagnosis is based on clinical examination with four key elements: appropriate age (10-15 years), pain localized to the tibial tuberosity, palpable and painful bump, aggravation with sports activities. X-rays are rarely necessary. No blood tests are required.

An experienced physical therapist or doctor can usually diagnose Osgood-Schlatter disease in a few minutes. The examination begins with simple questions about age, level of athletic activity, and the exact location of the pain.

A physical examination quickly confirms the diagnosis. The professional palpates the tibial tuberosity to identify where the pain is most severe. This palpation precisely reproduces the pain felt. The sensitivity is localized to a very specific point, not diffuse throughout the knee.

The professional may also perform simple functional tests. For example, asking the young person to squat or jump on the spot. These movements typically reproduce the pain, which reinforces the diagnostic certainty.

Imaging: X-rays are not usually necessary. If prescribed, they may show a fragmented or irregular tuberosity, which confirms the diagnosis but does not influence treatment. No blood tests are necessary, as this is a local mechanical problem.

In some cases where the diagnosis remains uncertain or when the symptoms do not exactly match the typical clinical picture, imaging may be requested to rule out other conditions. But for the vast majority of young people, a clinical examination is sufficient.

How does physical therapy help your teenager?

Physical therapy helps through education, training load management, quadriceps and hamstring stretching, and progressive strengthening. It allows most young people to continue their sports activities with appropriate modifications during natural healing.

Intervention	Objective	Application
Education	Reduce anxiety	Understanding benign nature
Expense management	Monitor symptoms	Reduce jumps/runs by 30-50%
Stretching	Reduce tension	Quadriceps and hamstrings, 30-60 seconds/day
Eccentric strengthening	Improve tolerance	Supervised progressive exercises
Inflammation control	Relieve pain	Ice 15-20 minutes after exercise

The role of the physical therapist begins with education. Understanding the benign and self-resolving nature of this condition greatly reduces anxiety, both for you and your young athlete. This educational step is often underestimated, but it is the foundation of successful management.

Load management is the most important intervention. The physical therapist helps identify which activities aggravate symptoms. Then he or she works with the young person, you, and sometimes the coach to temporarily modify the volume or intensity. Often, reducing the volume of jumping and running by 30 to 50% allows symptoms to improve while maintaining participation in sports.

This approach to load management does not necessarily mean stopping exercise completely. Rather, it involves making smart adjustments to certain parameters: reducing the number of repetitions of a specific exercise, alternating days of intense training with lighter days, or modifying certain movements to reduce stress on the knee.

Stretching exercises are the second key component. Regular, gentle stretching of the quadriceps and hamstrings reduces tension on the tibial tuberosity. These stretches should be held for 30 to 60 seconds and repeated daily.

Progressive eccentric strengthening can also be incorporated once acute symptoms have subsided. These exercises strengthen the tendon and improve its ability to tolerate athletic loads. They should be introduced gradually and supervised by a physical therapist.

Applying ice wrapped in a cloth for 15 to 20 minutes after sports activities reduces local inflammation. Never place ice directly on the skin.

If your child's knee pain is affecting their participation in sports, our specialized physical therapists can assess their condition and develop a personalized plan. Discover our physical therapy services for knee pain.

Can your child continue playing sports?

Most young people can continue playing sports with appropriate modifications. Reducing the amount of jumping and running by 30 to 50% often helps control symptoms. Complete cessation is rarely necessary. Participation maintains physical fitness and social connection with the team.

The strategy is not to stop everything, but to make smart adjustments. Your child can usually continue to participate in practices and games by modifying certain aspects. For example, reducing the number of jumps during warm-ups or limiting repetitive sprints.

Participation criteria: If the pain remains tolerable during and after the activity, the young person can continue. If the pain becomes severe or persists long after exercise, further reduction is necessary.

A practical guide to assessing tolerance: pain should not exceed 3 or 4 on a scale of 10 during activity. It should not increase cumulatively from one session to the next. If your child wakes up the next day with more pain than before training, this is a sign that the volume was too high.

Communication with the coach is important. Explain the condition and any recommended modifications. Most coaches are understanding and can adapt exercises for your child while keeping them integrated into the team.

Some young people benefit from wearing a bandage or knee pad with protective padding during sports. This protection reduces discomfort during direct contact or falls on the knees.

How long does this condition last?

The condition typically lasts 12 to 24 months until the growth plate closes (ages 14-18). Symptoms fluctuate depending on activity. Once growth is complete, the pain disappears completely in 90% of cases without any functional sequelae.

Phase	Duration	Features
Start	Weeks	Intermittent, mild pain
Progression	1-3 months	Intensification if activity continues
Stabilization	12-18 months	Pain present but tolerable
Resolution	Variable	Gradual decrease with maturation

The duration varies depending on the stage of skeletal maturation when symptoms begin. A young person who develops the condition at age 12 may live with it for 3 to 5 years. Another who develops it at age 14 may see their condition resolve in 12 to 18 months.

The long-term prognosis is excellent. Adults who have had Osgood-Schlatter disease do not show any increased incidence of knee osteoarthritis or functional limitations. Many retain a prominent bony bump at the tibial tuberosity, but it is completely painless.

This persistent bump is simply the result of additional ossification that occurred during the growth period. It has no functional consequences and does not limit physical activities in adulthood.

Important reminder: "Lasting 12 to 24 months" does not mean being unable to play sports during that time. With proper management, most young people can continue to participate.

When should you consult a specialist?

Consult your doctor if the pain persists at rest, lasts for more than 6 months despite physical therapy, or if significant swelling of the joint appears. Also consult your doctor if your knee locks or gives way. These rare situations require thorough investigation to rule out other conditions.

Alarm signal	Possible meaning	Action
Constant nighttime pain	Other possible pathology	Quick medical consultation
No improvement after 4-6 months	Diagnosis to be reconsidered	Full reassessment
General swelling of the knee	Infection or inflammation	Urgent assessment
Blockage or instability	Intra-articular lesion	Orthopedic consultation
Progressive weakness	Neurological problem	In-depth investigation

Most cases can be effectively managed by a physical therapist without specialized medical consultation. However, pain at rest that does not subside should be cause for concern. Typical Osgood-Schlatter disease improves significantly with rest.

If your child complains of pain at night in bed, even though they are not moving and not putting any weight on their knee, this is unusual. This nighttime pain warrants further evaluation to ensure that no other condition is present.

In rare cases where pain persists after the growth plate has closed, an orthopedic consultation may lead to surgical consideration. The procedure usually involves removing a small bone fragment that has not fused properly. The results are generally excellent, but only a small minority will require this procedure.

Supporting your young athlete

Osgood-Schlatter disease is a temporary condition with an excellent prognosis. Your role as a parent is to offer emotional support and patience during this growth phase. Remind your child that they have done nothing wrong and that their knees will heal naturally.

The psychological aspect should not be overlooked. For a teenager who is passionate about sports, having to reduce their training can be frustrating. They may fear losing their place on the team, disappointing their teammates or coach, or seeing their performance decline. Your understanding and support make all the difference.

Help your teen maintain a realistic perspective. This reduction in activity is temporary and strategic. It does not mean the end of their athletic career, but rather a smart adjustment to protect their long-term health.

With the right modifications and physiotherapy follow-up, the vast majority of adolescents get through this period while maintaining their participation in sports and athletic development. The key lies in patience, communication, and adherence to therapeutic recommendations.

Don't hesitate to ask your physical therapist questions. Understand the signs that indicate your child can continue and those that suggest slowing down. The more informed you are, the more effectively you can support your teenager during this period of growth.